Process for the preparation of dialkyldithiocarbamates of multivalent metals

Abstract

A direct method of preparing dialkyl-dithiocarbamates of multivalent metals by reacting the oxide of a multivalent metal with a secondary amine and carbon disulfide while simultaneously heating to 50°-95° C. and removing the so-formed water of the reaction. Suitable metal oxides are preferably lead oxide, zinc oxide, copper(II)oxide, iron(III)oxide, nickel(III)oxide, antimony(III)oxide and manganese dioxide. The reaction is preferably conducted in a solvent for the metal-dialkyl-dithiocarbamate which forms an azeotrope with water in order to remove the water of the reaction with the solvent.

What is claimed is: 
     
       1. A process for the preparation of a multivalent metal salt of a dialkyl-dithiocarbamate comprising reacting the oxide of a multivalent metal selected from the group consisting of lead oxide, zinc oxide, copper(II)oxide, iron(III)oxide, nickel(III)oxide, antimony(III)oxide and manganese dioxide, with a secondary amine of the formula ##STR2## wherein R and R' represent the same or different straight or branched-chained saturated or unsaturated hydrocarbon or cycloalkyl groups having from 1 to 13 carbon atoms and carbon disulfide and removing the formed water of reaction. 
     
     
       2. A process according to claim 1, wherein the reaction is conducted in a solvent for the metal-dialkyldithiocarbamate. 
     
     
       3. A process according to claim 2, wherein the solvent forms an azeotrope with water and the water of the reaction is removed with the solvent. 
     
     
       4. A process according to claim 2, wherein the solvent is selected from the group consisting of spindle oil, white oil, refinery oil, liquid ester waxes and liquid fatty acid esters. 
     
     
       5. A process according to claim 4, wherein the water of the reaction is distilled off in vacuo during the reaction. 
     
     
       6. A process according to claim 1, wherein the metal oxide is used in a stoichiometric excess of from 10 to 100 percent. 
     
     
       7. A process according to claim 1, wherein the carbon disulfide is used in a stoichiometric excess of from 5 to 20 percent. 
     
     
       8. A process according to claim 1, wherein the reaction is conducted at a temperature of from 50° to 95° C.